Drawing-in device for double front insertion devices on commercial writing machines



July 17, 1956 A. SALZBERGER 2,754,952

DRAWING-IN DEvIOE ROR DOUBLE FRONT INSERTION DEVICES ON COMMERCIAL WRITING MACHINES Filed Sept. 29, 1953 2 Sheets-Sheet l IIII lllllh July 17, 1956 A. SALZBERGER 2,754,952

DRAWING-IN DEVICE FOR DOUBLE FRONT INSERTION DEVICES ON COMMERCIAL WRITING MACHINES Filed- Sept. 29, 1953 2 Sheets-Sheet 2 United States Patent O DRAWING-IN DEVICE FOR DOUBLE FRONT 1N- SERTION DEVICES N COMMERCIAL WRITING MACHINES Andreas Salzberger, Frankfurt, Germany, assigner to Torpedo-Werke Aktiengesellschaft, Fahrrader und Schreibmaschinen, Frankfurt am Main-Rodelheim, Germany The present invention relates to a double front feed device in writing business machines, for the introduction independently of one or another of two front insert sheets from the front of the machine in front of a basic sheet situated in the machine, and relates to a new construction of the draw-in drive for these front insert sheets, whereby it is possible by way of an operating lever to actuate selectively the one or the other draw-in drive.

In a draw-in drive for a double front feed device in writing business machines having draw-in rollers for each draw-in chute which are adapted to be driven individually, the drive wheels for the draw-in rollers of the two chutes are, according to the invention, mounted so as to be freely rotatable on a control shaft which can be rotated, by a hand lever, said drive wheels being adapted to be selectively connected to the control shaft by way of slide keys independently of the position of the hand lever relative to said control shaft. In this case the hand lever is advantageously secured to the control shaft in such manner as to be outwardly pivotable radially to the said control shaft, and by this radial pivoting movement, the hand lever influences a rod adapted to be displaced in an axial bore of the control shaft against spring action, said rod being provided with engagement surfaces for the slide keys which are guided in the control shaft so as to be capable of being pushed out radially and which are associated with the two drive wheels, said slide keys being alternately operative to couple the related drive wheels to the control shaft.

Because of this pivotable mounting of the operating hand lever on the control shaft, and the selective slide key connection of the control shaft with one or the other of the two drive wheels, it is thus possible for the drawin rollers of the one or the other front feed device to be actuated from a hand lever, according to the pre-adjustment of said lever in each case. By providing intermediate stages in the rocking of the hand lever and by arranging a corresponding number of slide keys and drive wheels associated therewith on the control shaft it is possible to draw in one after the other a plurality of front insert sheets merely by manipulation of the pivoted hand lever.

The above, and other advantages and features of the invention, will be apparent in the following description of the constructional example shown in the accompanying drawing. In the drawing: Fig. l is a View of the control or drive shaft, some of the parts mounted thereon being shown in section, and Fig. 2 is a side view of one of the drive wheels mounted on the control shaft.

The draw-in rollers of two feed chutes disposed one before the other are for example connected to two drive wheels l, 2 which are preferably in` the form of gear wheels. The two drive wheels 1, 2 are provided with short hubs 24 which are mounted in a freely rotatable manner on a hollow shaft 4 which is in turn mounted on the machine frame so as to rotate about a fixed axis and which receives in its axial bore a control rod 6 ICC adapted to be axially pushed or displaced against the action of a spring 9. The control rod 6 is coupled by means of a pin-and-slot connection 10, 11, to the hollow shaft 4 and at the end projecting from the shaft 4 it carries a sleeve 12 on which a hand lever 3 is pivotally mounted. The pin 13 carried by the sleeve 12 and on which the hand lever 3 is mounted is situated eccentrically to the axis of said sleeve and intermediate the ends of the lever, and an abutment 14 on a fixed strap of the machine frame is disposed in the path of travel of the end 3a of the lever 3 adjacent the axis of the shaft 6 so that, when the hand lever 3 is rocked in the direction of the arrow A (Fig. 1), the aforementioned end 3a of the lever engages abutment 14 and further rocking of the hand lever causes axial displacement of shaft 6 against the spring 9.

The control rod 6 is provided with two recessed portions 15, which are so arranged that in each end position of the rod 6 relative to the hollow shaft 4 one or the other of two slide keys 5, which are guided in slots 16 of the hollow shaft 4 so as to be radially displaceable, is pushed radially out, for example, the key 5 to the left in Fig. 1.

The hollow shaft 4 carries two bushings 17 and 19 and also spacer rings 18 and 20. The bushings 17 and 19 are provided with slots for the passage of the keys 5 and receive tension springs 21 arranged about the said bushings, the ends of the said springs being connected to a strap 23 mounted in a cutaway portion 22 of the related key 5. The keys 5 are thus urged radially by they springs 21 in the direction radially inward against the control rod 6.

Between the spacer ring 18 and the hub of the gear wheel 2, a coupling stirrup 26 is mounted in two diametrically opposed, parallel recesses 25 of the hollow shaft 4.

A return spring 2S is guided over a fixed-axis roller 29 and is suitably attached to a rod 30 (Fig. 2).

Each of the two gear wheels 1, 2 carries on a pin 31 a coupling lever 32 held by a strong spring 33 which extends between said lever and a hook 34 projecting from the related gear wheel 1 or 2 and which holds the coupling lever 32 in a basic position relatively to the gear wheel 1 or 2 wherein a part of the lever 32 engages a suitable abutment (not shown) on the related gear wheel to limit the spring urged rocking of the lever 32 relative to the gear wheel. The coupling lever 32 is provided at the end thereof with a nose 35 which lies within the reach of the key 5 pushed out by the control rod 6.

The non-operative position of the gear wheels 1, 2, is\ determined by an abutment 38 which in the basic position of the gear wheels 1, 2, abuts on an adjustable cam 36 on a spindle 37 carrying the roller 29.

In the illustrated embodiment, the angle through which the gear wheel 1 or 2 can be turned is determined by a counter-abutment 39, which is in the form of a rider mounted on the hub holding the gear wheel and is adjustably secured relative to the related gear wheel by means of a locking screw 40 engaging in an arcuate slot 41 of the related gear wheel. Thus, the turning of each gear wheel is limited between the basic or inoperaa tive position (Fig. 2) wherein an abutment 38 on the lever 32 engages the cam 36, and a final, adjustable position wherein the counter-abutment 39 engages the cam 36.

The new arrangement operates as follows:

In the normal position of the hand lever 3 (Fig. l) the control rod 6 is situated in its left end position, in which it is held by the spring 9. In this position, a shoulder 42 on control rod 6 abuts against the coupling stirrup 26. The key 5 associated with the gear wheel 1 is pushed out by the control rod 6 against the action of the spring 21 loading said key and is disposed within the range of the nose 35 of the coupling lever 32 on gear wheel 1.

By pulling on the hand lever 3 the sleeve 12 along with the control rod 6 is rotated and by way of the pin-and-slot connection 10, 11 entrains the hollow shaft with the bushings 17 and 19. The coupling stirrup 26 also takes part in this turning movement, so that the return spring 28 is tensioned. The gear wheel 1 is driven by the pushedout key 5 by way of the coupling lever 32, while the gear wheel 2 remains unaffected. The movement of the gear wheel 1 is transmitted by way of a pinion 44 meshing therewith (Fig. 2) and by other suitable gear wheels (not shown) to the draw-in rollers of the front feed device (not shown).

The hand lever 3 can be pivoted about the axis of rod 6 until the draw-in rollers are locked by the feeling ar rangement of the front feed device (not shown) or until in the end position the counter-abutment 39 bears on the cam 36. shaft 4 and the control rod 6 with the parts mounted thereon are returned to the basic position by the action of the spring 28. The return of the gear wheel is effected upon release of the spring motor (not shown) which is tensioned during the drawing in of the front insert sheet, said spring motor turning back the draw-in rollers to eject the front insert sheet, and the backward turning of the draw-in rollers being communicated to the gear wheel 1 or 2 by the related gear transmission.

For the turning of the gear wheel 2 the hand lever 3 is pivoted outwardly in the direction of the arrow A (Fig. l) about the pin 13 holding said lever on the sleeve 12. In this movement the other end 3a of the said lever bears on the abutment strap 14, and the sleeve 12 is moved to the right together with the control rod 6 until the other shoulder 43 abuts against the coupling stirrup 26. In this position the key 5 associated with the gear wheel 2 is pushed out, while the key 5 for driving the gear wheel 1 is held by the spring 21 in the recessed portion 15 of the control rod 6. Thereafter, by pulling on the hand lever 3 to turn tbe latter about the axis of rod 6, the gear wheel 2 is entrained and drives the draw-in rollers coupled therewith for the second front insert sheet.

1 claim:

l. A drive arrangement for double front feed devices in business writing machines including two draw-in rollers adapted to be individually driven; said drive arrangement comprising a drive wheel for each draw-in roller, a control shaft having said drive wheels mounted thereon for independent rotation relative to said shaft, means for rotating said shaft including a hand lever mounted for rocking relative to said shaft, and means for alternately coupling said drive wheels to said shaft, said coupling means including a slide key associated with each of said drive wheels and movable between a coupling position and a release position, and actuating means for said keys operative to alternately dispose said keys in the coupling and release When the hand lever 3 is released the hollow positions thereof in response to rocking of said hand lever relative to said shaft.

2. A drive arrangement according to claim l; wherein said control shaft has an axial bore therein and radial slots receiving said keys to permit radial displacement of the latter relative to said shaft between said coupling and release positions; and wherein said actuating means includes a rod slidable axially in said bore and having control surface portions alternately engageable with said keys, a spring acting against said rod to urge the latter axially to a position wherein one of said keys is engaged by the related control surface portion of said rod, and means converting rocking of said lever relative to said control shaft into axial movement of said rod in the direction opposed by said spring.

3. A drive arrangement according to claim 2; further comprising pin and slot means preventing relative rotation of said rod and shaft; and wherein said means converting rocking of said lever into axial movement of the rod includes a sleeve fixed on said rod and carrying a pivot extending normal to a plane passing through the axis of said rod, said hand lever being rockably mounted on said pivot, and fixed abutment means engageable by said lever so that the latter, when rocked in one direction, bears against said fixed abutment means and displaces said pivot, and hence said sleeve and rod, in the axial direction opposed by said spring.

4. A drive arrangement according to claim 2; further comprising spring means yieldably urging said keys radially inward against said rod, and return spring means connected to said shaft to effect return rotation of the latter in one direction following the rotation of said shaft in the opposite direction by manipulation of said hand lever; and wherein each of said drive wheels carries a driving abutment engageable with the related key when the latter is displaced radially outward by said rod to its coupling position.

5. A drive arrangement according to claim 4; wherein each of said driving abutments is pivotally mounted on the related driving wheel and spring urged relative to the latter in the direction toward the related key, an arm extending from each of said driving abutments, and a fixed stop member interposed in the path of said arm of each driving abutment to be engaged by said arm and thereby to limit the rotation of said drive wheels in the direction of said return rotation of said control shaft.

6. A drive arrangement according to claim 5; further comprising a movable stop member angularly adjustable on each of said `drive wheels and engageable with said fixed stop member to limit the rotation of the related drive wheel in said opposite direction of rotation of said shaft by manipulation of the hand lever.

Hegnauer Oct. 16, 1945 Maurer Apr. 20, 1954 

